Heat is the sum of kinetic energy of all molecules of a substance. We use the expressions of hot and cold in our daily life on a number of occasions. We use heat for cooking food and keeping our body warm. We can get heat from coal, gas or electricity and sun. The degree of hotness and coldness of an object is called its temperature. Temperature is usually measured in the Celsius scale or Fahrenheit. The normal human body temperature is 98.40 Fahrenheit or 36.90 Celsius.
Temperature is a measure of how hot or cold a body is. Temperature is usually measured in the Celsius scale or Fahrenheit scale. Temperature of the system can be defined as the property that determines whether or not the body is in thermal equilibrium with the neighbouring system. If the number of systems is in thermal equilibrium, this common property of the system can be represented by the simple numeric value called temperature.
Differences between Heat and Temperature
The differences between heat and temperature can be summarised in points as follows:
S.N | Heat | S.N | Temperature |
1. | Heat is the form of energy that flows from the system to its surroundings. | 1. | Temperature is the result of heat. |
2. | Mass of the body affects the total heat. | 2. | Mass of body does not effect on temperature but depends on the molecular vibration of the body. |
3. | Heat is measured in joules or calories. 4.2 Joules = 1 calorie | 3. | Temperature is measured in degree Celsius or degree Fahrenheit or Kelvin Scale. |
4. | Heat is measured by using a Calorimeter. | 4. | Temperature is measured using the thermometer. |
S.No. |
Heat | Temperature |
1 | Heat is a kinetic energy of all molecules of a substance. | Temperature is the degree of hotness and coldness of a body. |
2 | Its SI unit is joule. | Its SI unit is Kelvin. |
The two common scales of the temperature are the Celsius scale and the Fahrenheit scale.
The temperature of pure melting ice and that of steam on the Celsius scale is 0 degree centigrade to 100 degree centigrade.
\begin{align*}\frac {(K-273)}{100}= \frac {(C-0)}{100} \\ \text {or,}\: (100 – 273) &= C \\ \text {or,}\: C &= -273 + 100 \\ \text {or,}\: C &= -173 \\ \text {Thus,}\: 100\:K &= -173^o\:C. \\ \end{align*}
\begin{align*} \frac {(C – 0)}{ 100} &= \frac {(K- 273)}{100} \\ \text {or,}\: 220 &= K-273 \\\text {or,}\: K &= 273 + 220 \\ K &= 493 \\ \text {Thus} \: 220^o\:C &= 493\: K \\ \end{align*}
\begin{align*}\frac {(C-0)}{100} &= \frac {(F-32)}{ 180} \\\text {or,}\: \frac {30}{10} &= \frac {(F-32)}{18} \\\text {or,}\: 30 \times 18 &= (F – 32) \times 10 \\ \text {or,}\: 540 &= 10F – 320 \\ \text {or,}\: 540 + 320 &= 10F \\ \text {or,} F = \frac {860}{10} \\ \text {Thus}\: 30^o\:C &= 86^o\:F \\ \end{align*}
One calorie is the amount of the heat required to raise the temperature of one gram of water by 1°C.
$$ \frac {(C – 0)}{100} = \frac {(F – 32)} {180} = \frac {(K – 273)} {100}$$
Unit of heat is ______.
degree
kilogram
meter
Joule
Device used for measuring temperature is ______.
Thermometer
Speedometer
Odometer
Barometer
The hotness on an object is determined by its ______.
pressure
none of these
temperature
heat
The temperature of boiling water cannot be measured by ______.
clinical thermometer
laboratory thermometer
All the answers are correct
both clinical and laboratory thermometer
A wooden spoon is dipped in a cup of ice cream , its other end ______.
becomes cold
becomes hot
does not become cold
becomes cold by the process of radiation
The boiling point of water is ______.
357°C
39 °C
100°C
0°C
Higher the temperature of the body ______ the kinetic energy of the molecules of that body.
Same
Lower
none of these
Higher
The device that measures the degree of hotness and coldness of a body is called ______.
lactometer
thermometer
calorimeter
temperaturemeter
Which is the most commonly used liquid in the thermometer?
ethanol
water
alcohol
mercury
Process of division of temperature scale in thermometer is called ______.
marking of thermometer
calibration of thermometer
division of thermometer
separation of scale in thermometer
The advantages of using mercury in a thermometer is ______.
it does not stick in the glass
the calibration of mercury is easier as it expands uniformly at ordinary temperature
it can be used to measure wide range of temperature
all of the answers are right
Clinical thermometer was invented by ______.
Sir Arthur King
Sir Isaac Newton
Sir Clifford Allbutt
Graham Bell
Clinical thermometer was invented in _______.
1860 A.D.
1850 A.D.
1890 A.D.
1870 A.D.
The thermometer used to measure the maximum and minimum temperature of a day is called ______.
maximum and minimum thermometer
clinical thermometer
horse shoe thermometer
day and night thermometer
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What is one joule heat
Mar 30, 2017
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Santosh Sharma
What is one calorie
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ranjan
relatiionship betn heat and tempreature
Dec 27, 2016
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